Apparatus fob molding bituminous



April 30, 1935.

A. J. PFOHL APPARATUS FOR MOLDING BITUMINOUS MATERIALS Original FiledJune 25, 1925 2 Sheets-Sheet l April 1935- A. J. PFOHL i Re. 19,

APPARATUS FOR MOLDING BITUMINOUS MATERIALS Original Filed June 25, 192$2 Sheets-Sheet 2 Reiseued Apr. 30, 1935 UNITED STATES 7 19.553arrans'rus roa MOLDING m'raams PATENT OFFICE m'rrmnsous corporation ofOhio Orlginal No. 1,785,457, dated Deoember'IIi, 193., Serial No.39,619, June 25, 1925. Application for reissue August 9, 1932,Serial'No. 628,098

19Claims.

My invention relates to apparatus for forming or molding plasticmaterials. It is especially adapted to the molding of plastic materialsinto either solid or hollow products, and to the molding of saidmaterials at a very low cost. It is also addressed to providing meanswhereby the shape into which the material is to be molded can be readilyand at very little expense changed. It is adapted to the continuousformation of plastic materials into sections of indefinite lengthadapted to be cut to any length desired. My invention is especiallyadapted to the molding or formation of bituminous products or productsformed from bituminous and other materials such as expansion Joint, railfillers, paving block, conduits,

shingles or any other similar products.

Inthe drawings in which like characters represent like parts,

Fig. 1 is a diagrammatic view of my apparatus. Figs. 2 and 3 are detailviews of my extrusion die.

Fig. 4 is a modification of my extrusion die,

Pig. 5 is an enlarged fragmentary perspective view of one form ofarticleor product made by h p a a d Fig. 6 is a fragmentary perspective view ofanother form of article. or product which may be made by the apparatus.

Imthe drawings A is a mixing or macerating tank provided with anysuitable mixing and, if desired, cutting or chopping means. I have shownmixing paddles A mounted on a spindle A which may be rotated by any,suitable power. 'Ihismixingtankissteamjacketedsoastomain tain thecontents at the desired temperature while being mixed. Suitable steamintake pipe D and outlet pipes E" for the steam jacket are pro.- vided.The mixing tank is provided with intake parts B and C for the materialsfrom which 44 product is to be made.

' An outlet from the mixing tank A is provided in the form of a steamjacketed pipe G which is provided with suitable intake pipe I and anoutlet part J for the steam. Within this steam jacketed pipe G is ascrew conveyor H which may be operated in any well known manner by anysuitable'power. At the opposite or outlet end of the conveyor H is alarge steam jacketed tank K which contains a plunger L which when notbeso; ing .-operated is preferably held above the inlet tot he tank Kfrom the conveyor H. This plunger is hydraulically or otherwise operatedin any well known manner to force the plastic mass out from the tank Kthrough the. passage I under preslfi sure. This passage I is of anydesired form depending upon the'form desired for the final product, Thepassage I is formed in-any suitable metal, preferably Babbitt metalremovably fixed within a steel pipe. As'shown in the: drawings thepassage I is in the form of one of the many 5 forms of rail fillers. Inthe formation of the passage I first make a form of the product .desiredand melting the metal pour itaround the form. When it is cold I removethe core and have the passage of the desired form. Babbitt metal is 10very satisfactory for the purpose. The extrusion die 2 containingpassage I as stated is removably fixed within the steelcylinder or pipe3 having a flange 8 whichis provided with holes 9 through which passbolts aattaching same to the tank K 3 g as shown in Fig. l. Surroundingthe cylinder or pipe 3 isanother cylinder or pipe III of greaterdiameter. This cylinder is held in place by the filler rings 66, one ateach end. The ends of the cylinder III are welded to the cylinder orpipe 3 so as to seal the space between the two cylinders and form asteam jacket surrounding the die 2 containing the passage I. Suitablesteam inlet II and outlet I2 are provided and steam from any suitablesource may be passed into the jacket. In this way the die 2 containingthe passage I may be kept at the desiredtemperature to permit thebituminous or other plastic mass to be forced through it from the tank Kand give it the desired form. While I have shown a plunger L to force.the plastic material through the passage I, if desired any suitablemeans could be used. If desired a screw conveyor, such as H, could beused to force same throughthe passage I from the mixing tank or from astorage tank. It will be seen from the foregoing that means are providedfor keeping the bituminous plastic material or batch containingbituminous material in a heated condition toretain its plasticity so asto permit its being worked. Adjacent to the oulet end of the passage! islocated cooling means for cooling the product as it is extended from thepassage I, so that it will retain its forms As shown the outletendof thepassage I discharges the producton to an endless conveyor S supported onrotating rollers T, T, within a tank P. Located above the conveyor is apipe or coil of pipes Q having openings or outlets U. This pipe Qconveys, from any suitable supply cold water which through the openingsU is sprayed on the extruded product as it is being conveyed, on theconveyor 8 through the cooling tank.. This cooling of the product as itis being extruded from the. s a e Iroauses it toretain its-form. A conveyor V isarranged to take the product from the pulverant material 'suchas loapstme, mica, send or similar material above the conveyor Y so thatif it is desired to surface the product with a nonadhesive surface itcan be dropped an it from the hopper as it passes under it on theconveyor Y. The apparatus described is especially adapted for carryingout my process or making bituminous products containing either materialor bituminous material and a fillerci any desired materials such asmineral particles, fibrous materials, etc. This process is disclosed andclaimed in my application Serial No. 432,199 filed February 28, 1830,which is a division of this application. As shown the apparatus isarranged to make rail filler and I will describe theprooess of suchmanufacture using as the materials for forming the product, asphalt anda filler or fibrous and mineral material such as roofing felt,

'andsmallparticlesofmineraisuehascrushed slate. Such filler materialisreadily obtained as the waste or by product resulting fromthemanufacture or prepared roofing either plain or mineral surfaced.This waste product-will also have a quantity d bitumen in it. Into thetank A is put this waste product containing roofing felt, mineralgranules and asphalt, if the roofing was an asphalt prepared roofing, asufileient quantity of asphalt is added to iorm, the desiredproportions. In the heated tank the materials are kneaded and thoroughlymixed and a plastic mass formed therofiom. The asphalt is reduced to aplastic state and the fibrous and mineral particles thoroughlydistributed through the plastic mass by the kneading and mixing in thistank. Having produced the plastic mass and while retaining it in thatcondition of plasticity I pass it through an extmsion die having-anorifice of the desired shape, under pressure which causesittocompietelyiilltheorificeandtoassume, and retain as it is extrudedtherefrom, the shape of the orifice. Care must be taken that the plasticmass is not heated to a condition when it will be fluid or how readily.This can readily be detcrmlnedby those skilled in the met using suchmaterial and will depend upon the asphalt or other bitumen being used.As themes in its desired formis extruded I immediately-cool some so asto prevent deformation and then out it to the desired length. Ii it istobe surfaced with a L non-adhesive surfacing this is applied eitherafter or before the cutting. Where it is desired to produce a producthaving a coredor hollow center such as conduits,- some forms of railfiller, etc, I form a metal core it which is of the form desired. In 4,I have shown the die of Figs. 2 and3providedwitha'eoreconformingtothedie. In some cases it may be'advisa'ble to heat this core and for thatpurpose I have divided it by a baile l4 fiirough'the center so'thatsteam entering the inlet ll through the core ononesideofthisbaflemdreturnstotheoutlet it any other suitable manner willnot interfere with theme of the mix through the passage I formed withinthe extrusion die 2 around the core I3.

I claim:

1. An extrusion mold consisting of a removable member formed of Babbittmetal, a support having an orifice, the removable member providing wallsfor an extrusion orifice, and means for heating said member. I

' 2. An apparatus for forming an article of a mixtureof bitumen andfibrous material, comprising a container for said material, means forreducing the fibrous materialto the desired size and for mixing samewith the bitumen, means for heating the mixture in said container, anextrusion die having a removable inner wall member formed of a metal ofthe character of Babbitt metal, and means for passing the materialthrough said extrusion die.

3. An extrusion mold consisting of a steam jacketed support, a memberwithin said support having an orifice with walls formed of smooth castmaterial and a core within said orifice.

4. An extrusion mold having an orifice with a continuous seamless wallof smooth metal fusible at a comparatively low temperature.

5. An extrusion moldwlth an orifice having a continuous seamless wall ofBabbitt metal.

6.' An extrusion mold for molding bituminous material by extrusion,having an orifice with continuous walls of a metal having a low degreeof adhesiveness with bitumen.

'7. In an apparatus for forming bituminous material into objects of agiven shape of cross-section by extrusion, a container having an outletorifice,means tor heating the container, means] for forcing thematerial'into the heated container, a die supporting member removablyattached to said container over the orifice, and an extrusion die havingan inner wall memberof a metal of the character of Babbitt metal.

8. In an apparatus for forming bituminous material into objects of agiven cross-section by extrusion, an extrusion die having a main body ofrelatively hard strong metal and a removable inner wall member of areadily cast metal of low fusing temperature. 7

9. An extrusion die comprising a supporting member, a removablecontour-forming member formed of a readily cast metal of the characterof Babbitt metal, and means for heating the sup- 10. Apparatus fortreating'nbre and bitumen which comprises means for reducing the bitumentoaplastic state, meansforkne'adingandmixing the plasticmass tothoroughly distribute the fibrous particles through the mass, means forthereafter transferring the mass in a plastic condition from saidkneading and mixing means to an extrusion die having an orifice withcontinuous walls of a metal having a low degree of ad hesiveness withbitumen and for extruding the plastic material from said die.

ll. Apparatus for treating-fibrous bitumen imw sn'ated material whichcomprises means, including a heated container, for reducing the bitumento a plastic state, means within the container for reducing the materialin size and kneading and mixing the plastic mass to thoroughlydistribute the fibrous particles through the mass, and means forthereafter transferring the mass in a plastic condition from saidkneading and mixing means to an extrusion die having an orifice-withmetal walls and for extruding the plastic material from said die.

12. Apparatus for treating fibrous bitumen im-' pregnated material whichcomprises means for reducing the bitumen to a plastic state, means forkneading and mixing the plastic mass to thoroughly distribute thefibrous particles through the mass, a storage reservoir heated tomaintain the material in a plastic condition, means for transferring themass in a plastic condition from said kneading and mixing means to saidstorage reservoir, and means including an extrusion die having anorifice with metal walls for extruding plastic material from saidreservoir to form an article of the desired shape.

13. Apparatus for treating fibrous bitumen impregnated material whichcomprises means for reducing the bitumen to a plastic state, paddlemeans for kneading and mixing the plastic mass to thoroughly distributethe fibrous particles through the mass, a container heated to maintain'the material in a plastic condition, means for transferring the mass ina plastic condition from said kneading and mixing means to saidcontainer, and means including a metal extrusion die for extruding thematerial from said container to form an article or the desired shape.

14. Apparatus for treating fibrous bitumen impregnated material whichcomprises means for reducing the bitumen to a plastic state, means forreducing the material in size and for kneading and mixing the plasticmass to thoroughly distribute the fibrous particles through the mass, acontainer heated to maintain the material in a plastic condition, meansfor transferring the mass in a plastic condition from said kneading andmixing means to said container, means including a heated extrusion diefor extruding the material from said container to form an article of thedesired shape, and means for cooling the extruded article to cause it'toretain its form.

15. The combination of kneading means for distributing fibrous particlesthrough plastic bitumen or the like, a storage reservoir arranged toreceive the plastic kneaded mass, means for controlling the temperatureof said reservoir to maintain the mass therein plastic, an extrusion dieand means for forcing plastic material from said reservoir through saiddie.

16. The combination of kneading means for distributing fibrous particlesthrough plastic bitumen or the like, a storage reservoir arranged toreceive the plastic kneaded mass, means for controlling the temperatureof said reservoir to maintain the mass therein plastic, an extrusion diehaving an orifice with walls of a metal having a low degree ofadhesiveness with bitumen, and means for forcing plastic material fromsaid reservoir through said die.

1'7. The combination of kneading means for distributing fibrousparticles through plastic bitumen or the like, a storage reservoir forthe kneaded mass, means for controlling the temperature of saidreservoir to maintain the mass plastic, heated means for transferringthe mass from said kneading means to said reservoir, a metal extrusiondie, and means for forcing plastic material from said reservoir throughsaid die.

18. The combination of kneading means for distributing fibrous particlesthrough plastic bitumen or the like, a reservoir arranged to receive theplastic kneaded mass, means for controlling the temperature of saidreservoir to maintain the mass therein plastic, an extrusion die havingan orifice with metal walls and a core within said orifice, means forheating said die and core, and means for forcing the plastic materialfrom said reservoir through said die.

19. Apparatus for treating fiber and bitumen which comprises means forheating the bitumen and for kneading and mixing the fiber and the heatedbitumen to thoroughly distribute the fiber particles through the massand form a plastic mass and means for transferring the mass in a plasticcondition to an extrusion die having an orifice and for extruding theplastic material from said die.

ANTHONY J. PFOI-IL.

